中文摘要：

采用粒子图像测速仪对离心泵叶轮内部盐析晶体颗粒分布进行了测量和分析.试验结果表明：叶轮流道中间轴截面上,在叶轮进口处多为小粒径颗粒,分布较均匀,且叶轮内晶体颗粒数密度分布在轴向上存在差异,呈现前盖板处轴截面上最小,后盖板处轴截面上最大的分布特点;沿径向,逐渐有大粒径颗粒,且大颗粒主要位于压力面及附近,至出口处大颗粒分布趋于均匀;当试验流量从0.8Q增加到1.2Q时,随着流量的加大,大颗粒向压力面聚集趋势越明显,颗粒平均粒径梯度愈大;当固相体积分数从0.75C增加到1.25C时,随固相体积分数的增高,同一区域晶体颗粒浓度变大,且大粒径颗粒数目显著增多;在试验介质温度从35℃提高到43℃时,因介质溶解度随温度升高而增大,则晶体颗粒粒径及数目随试验介质温度的升高而明显减小.

英文摘要：

Particle image velocimetry was adopted to measure and analyze the salt-out crystal particle size distribution in a centrifugal pump impeller at different operating conditions.Experimental results show that almost all particles at the inlet are small and distributed evenly at intermediate axial cross-section of impeller.The particle number density is different at different axial direction with the characteristics of small density at axial cross-section near front cover and large density near rear cover.There are some large crystal particles along radial direction,which are mainly located near the pressure side with even distribution at the outlet.When the experiment flow rate is increased from 0.8Q to 1.2Q,the aggregation tendency of large particles to the pressure side becomes obvious with larger average particle size gradient.The particle number density becomes larger and number of large-size particles is increased significantly with the raise of solid volume fraction from 0.75C to 1.25C.When solution temperature grows from 35 ℃ to 39 ℃,both the particle size and number density decrease obviously due to solubility increasing at high temperature.